Warp stop motion for looms for weaving



Aug. 23, 1932. A. M. M. COLLON WARP STOP MOTION FOR LOOMS FOR WEAVING Filed Jan. 7. 1931 Patented Aug. 23, 1932 UNITED STATES- PATENT OFFICE ALBIN' MARIE MAURICE 'COLLON, OF LYON, FRANCE WARP STOP MOTION FOR LOOMS FOR WEAVING Application filed. January 7, 1931, Serial No. 507,238, and. in France February 2, 1930.

This invention relates to improvements in V warp stop motions for looms for weaving.

Electric stop motions operating through the healds are becoming more and more used 7' 5 on looms for weaving at thepresent time.

The different arrangements based on this principle have numerous advantages over the other types of stop motion these advantages are amongst others that it-occupies 10 a minimum space, does not require any supplementary work at the time of inserting the warp in the loom, it will operate when a stoppage is produced or in other words a locking of two or more threads. as well as when through clumsiness the overlooker leans incautiously on the line of warps at the back of the loom.

All the difierent types of warp stop motions operating on this principle are subject to the numerous inconveniences in practice as they all necessitate a regulating system either of oscillating members or of connections and stops between the loom and the healds. In use, remembering that the movements of the healds are very abrupt these members rapidly become deranged the stops break down giving an uncertain operation, consequently defective. On the other hand, the poor operation of this system of warp stop motion is often caused by the plates which are very light being damaged either at the time of piecing up the threads or owing to the operation itself of the stop motion. It follows that they will not move freely to open or close the electric circuit.

The present invention relates to a warp stop motion operated by the healds of the loom and overcoming the aforesaid disadvantages since once it is operating on the 100111 it does not require any adjustment as it does not compriseany connecting link be tween the heald and the loom. each lifting heald frame the, plates which would be damaged or buckled are automatically straightened,

It is furthermore obtainable at a very low price.

It is essentially characterized in that the rod carrying the lower ends of the healds which is rigidly afixed to an electric con- Further to ductor kept at a given distance from the said rod by electrically insulating supports is suspended without other connection at the healds and frame and may be displaced parallelly to itself inside this latter under the action of the tension of the warps when the healds are in their lower position.

. It. will bereadily understood that in this position when there is a breakage of a warp,

or when a holding or catching occurs the corresponding heald is not drawn upwards by its thread and its lower and contacts with the aforesaid conductor due to its weight and thus through any suitable trip mechanisms stops the loom.

The invention will be described with reference to the accompanying drawing:

Fig. 1 is a front view of a heald frame its lower position.

Fig. 2 is a side view. 7 F'gs. 3 and 4 are corresponding views showing it in theraised position.

According to the invention in each heald frame or element the lower bar a is suspended I bythe loops 6? from the healds b suspended in their turn by loops 6 from theupper bar 0 which is rigidly affixed to the frame at. The

lower bar a aforesaid is thus free to be moved vertically between the ends of the frame.

This bar a is rigidly connected by supports e to an electric conductor f in circuit through a flexible lead 9 with one of the terminals of a source'of electric supply.

These supports 6 which hold the conductor f at a strictly constant distance from the lower bar a and which follow all the movements are electrically insulated at h'so that during the normal operation the electric current cannot pass from the conductor f to the frame 71 through the bar a.

Rods to the stops 7:: pass through the transverse memberfl of the-frame to limit the upward movement of the healds and the bars a and conductor f under the tension of the warps on passing through eyelets n in the healds b when heald frameis in its lower position.

The operation of such an arrangement will be readily understood.

In normal operation when the heald frame is in its raised position (Figs. 3 and 4) the tension of the warps m is exerted downwards on the healds b holding these latter in conjunction with their weight suspended by their upper loops 6 from the upper bar 0 rigidly aflixed to the frame d. In this position, the movable bar assembly a and the electric conductor f are also suspended by their weight from the lower loops 6 of the healds. The loops 6 are utterly preventedfrom contacting with the conductor Further in this position any heald which is faulty or buckled and due to this fact shorter than the rest itself carries the whole weight of the assembly a of which tends to correct it.

On the contrary, when the heald frame moves to its lower position (Figs. 1 and 2) the tension of the warps m is exerted upwards and raises all the healds to which remain suspended in the lower loops 6 the bar a and the conductor 7. This raising movement is limited by the stops coming in contact with the lower transverse member 2' of the frame.

Thus, in this position, if a warp such as m is broken the corresponding heald b which is no longer held upwards remains suspended owing to its weight by the upper loop 6 from the bar 0 and its lower end 6 comes in contact with the conductor which immediately connects this latter to the earthed member z and thus causing through suitable tug mechanism, stops the loom.

The same thing occurs if instead of a breakage of a warp there is a drawing of this latter downwards as would be produced by a holding or catching thereof.

As will be understood and as follows from what has preceded the invention is not limited either to the single method of operation described above or to its different parts but embraces on the other hand all variations comprising the application of the above arrangements.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, I declare that what I claim is:

In an electric warp stop motion for looms, the combination of a frame carrying the heddles and having a lower bar movable vertically with respect to the frame, and an electric conductor bar arranged below, parallel withand rigidly connected to said lower bar for movement therewith, so that upon the breaking of a warp thread, its heddle drops into contact with the conductor bar and completes an electric circuit, said frame having a lower transverse member, and the lower heddle bar and the conductor bar being provided with rods connecting them together, said rods being insulated from the conductor bar and movable vertically through said lower transverse member and provided with 

